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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7feb862d683e5e72076187993fa69275e3a3d114719f4077bb6330d414c05f6a' 
  AND token = 'v6WOHM2Dq3xGGXQTY6KKNMsfQRak9GYputcTboR3ihI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}